The Noam Pikelny Trick*
*Okay, because this is so advanced I don't know if I'd actually call it a trick, but it is a great start for learning how to blend melodic and single string like Noam.
Stick with this in the key of G for a few weeks until it starts to feel relatively comfortable, and then start doing it in different keys.
Make sure that you know your G scales in melodic and single string styles before tackling this. It'll be way more difficult to do it without that knowledge.